Programmers are known as early adopters, and since Stack Overflow is so successful, I think a general question and answer website open to the whole public will be extremely successful. Plus, I think that being built on a Microsoft stack, it would be bought by Microsoft in less than a year.

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5 Answers
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I can just imagine Joel and Jeff responding to a general q&a question:

xxxHotChixxxx: So like, I love my boyfriend sooooo much. I wan to get married and have 7 kids, but he says no. The other day he was lookin at my BFF Jillian, an he stared at her jus waayyyy too long. I think hes cheatin on me, but I want all those kids! What can I do!?!?!

BTW Im 13.

Joel: Well, now. In your circumstance, you should apply what I like to call "The Joel Test for Relationships". You need to rank this boyfriend of yours according to the results from this test, and compare it to offers from other "opportunities".

They have developed the StackExchange engine which would allow for people to create whatever kind of StackOverflow-like site they wish. I do not think they have any intention of making a Yahoo Answers killer because in all likelihood it would end up just as bad. The entire idea of having a single site for absolutely everything brings far too much noise and not enough signal.